binder: Add copyright notice to new kunit files

Clean up for the binder_alloc kunit test series. Add a copyright notice
to new files, as suggested by Carlos [1].

[1] https://lore.kernel.org/all/CAFuZdDLD=3CBOLSWw3VxCf7Nkf884SSNmt1wresQgxgBwED=[e-mail]/

Fixes: 5e024582f494 ("binder: Scaffolding for binder_alloc KUnit tests")
Suggested-by: Carlos Llamas <[e-mail]>
Cc: Joel Fernandes <[e-mail]>
Signed-off-by: Tiffany Yang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/android/tests/.kunitconfig

···
+#
+# Copyright 2025 Google LLC.
+#
+
 CONFIG_KUNIT=y
 CONFIG_ANDROID_BINDER_IPC=y
 CONFIG_ANDROID_BINDER_ALLOC_KUNIT_TEST=y

drivers/android/tests/Makefile

···
 # SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright 2025 Google LLC.
+#
 
 obj-$(CONFIG_ANDROID_BINDER_ALLOC_KUNIT_TEST)	+= binder_alloc_kunit.o

drivers/android/tests/binder_alloc_kunit.c

···
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Test cases for binder allocator code
+ * Test cases for binder allocator code.
+ *
+ * Copyright 2025 Google LLC.
+ * Author: Tiffany Yang <[e-mail]>
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt